Grinding machine



Dec. 12, 1933. F. s. HAAS GRINDING MACHINE Filed AprilA 4, 1932 4 Sheets-Sheet l Y llllllllllll lu 'l Dec. 12, 1933.

F. s. HAAs 1,938,765

GRINDING MACHINE Filed April 4, 1932 4 Sheets-Sheet 2 GMM i Dec. 12, 1933. F. s. HAAs GRINDING MACHINE 4 Sheets-Sheet 3 Filed April 4, 19:52

Y x@ 9,. I @QS 7 y 2/ A wz V J u .0 A@ M @/M 5,45 J9 J J4! Dec. l2, 1933. F, s. HAAs 1,938,765

GRINDING MACHINE Filed April 4. 1932 4 Sheets-Sheet 4 Y df Patented Dec. 12, 1933 UNITED STATES GRINDIN G MACHINE Frederick S. Haas,

Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati, Ohio, a corporation of Ohio Application April 4, 1932. Serial No. 603,047

20 Claims.

This invention relates to. improvements in grinding machines and especially to improvements in what are commercially known as centerless grinders.

An object of this invention is the provision of improved means for effecting the rotation` of a tool or control member of'a machine tool organization. l,

Another object of the invention is the provision of an improved driving mechanism for rotating the regulating wheel of a centerless grinder at different speeds.

A further object of the invention is the provision of a driving mechanism for a regulating Wheel, which may be readily changed or varied to drive the said wheel at its normal work rotation controlling speed and at a relatively high speed for effecting the trimming or truing thereof, when made of abrasive material, without varying or changing the work rotation speed setting.

A still further object of the invention is the provision of simple efficient means for effecting this change in speed without deranging the adjustment thereof and so that the regulating wheel may be readily connected with its slow speed drive for again rotating it at the comparatively slow work rotation controlling speed.

Other objects and advantages of the present invention should be readily apparent by reference to the following speciiication considered in conjunction with the accompanying drawings, forming a part thereof, and it is to be understood that any modifications may be made in the exact structural details there shown and described within the scope of the appended claims wthout departing from -or exceeding the spirit of the invention.

In the drawings: l

FigureI 1 is a side elevation of a centerless grinder embodying the improvements of this invention.4

Figure 2 is a plan view of the machine shown in Figure 1 and as seen from the front of the machine when looking directly into the grinding throat.

Figure 3 is an enlarged plan view of the regulating wheel unit.

Figure 4 is a. sectional view taken substantially on line 4-4 of Figure 2, certain parts being shown in elevation.

Figure 5 is a sectional view on a plane parallel with, but below the plane of Figure 3 and as seen substantially from line 5--5 of Figure 4.

Figure 6 is a sectional view taken on line 6-6 of Figure 5.

. on line 8 8 of Figure 5.

Figure 9 is a fragmentary elevational view as 30 seen from line 9-9 on Figure 8.

Throughout the several views of the drawings similar reference characters are employed to denote the same or similar parts.

The machine illustrated in the drawings consists of a bed 10 extending substantially vertical with its operating or movable parts adapted to be actuated in a plane extending at an acute angle to :the vertical. The bed 10 is provided along this angular plane with guideways 11 receiving 70 and guiding a grinding wheel carriage 12 in its movement relative to the bed 10. The grinding wheel carriage 12 has formed integral therewith or secured thereto a bearing 13 in which is rotatably journaled a spindle 14. Secured to one end 7 of the spindle 14 is a grinding wheel 15 adapted to be rotated with the spindle at a high grinding rate of speed in a clockwise direction. The spindle 14 has secured thereto and enclosed within the guard or housing 16 a driving pulley about 30 which the belt or other flexible transmission means 17 extends. The belt 17 is in turn trained about a pulley secured to a countershaft 18 carried in the lower end of belt tightener arm 19 mounted interiorly of the bed l0. The shaft 18 may carry an additional pulley in line with the sheave or pulley 20 on the motor shaft 21 and about which is trained the flexible transmission or belt 22. The motor shaft 21 is associated with a suitable prime mover, illustrated -in the drawings as an electrical motor 23, carried by a bracket or support 24 secured to or formed integral with the bed 10 and interiorly thereof. From the foregoing it will be noted that the grinding wheel l5 and its spindle 14 are rotated at a comparatively high rate of speed directly from the prime mover or motor23.

The carriage 12 has secured to it a hood or guard 25 that encloses the grinding wheel 15 having secured thereto the water nozzle 26 for directing the coolant usual with grinding machines to the point of grinding or contact between the wheel and work. The guard 25 is further provided with a guide 27 for a truing mechanism 28 which is actuated longitudinally of the guide 27 transversely of the operative face of the grinding wheel 15.

The bed 10 is further provided along its inclined operative surface with a bracket or housing 29 to which is secured a head or bearing 30 110 Yhaving journaled therein a spindle 31. The

spindle 3l is provided at one end with a tapered nose 32 on which is secured a collet 33 for the regulating wheel 34. The collet 33 is held on' the nose 32 by means of a nut 35 received upon the reduced threaded end 36 of the spindle. Beyond the tapered nose 32 the spindle 31 is formed with a bearing portion 37 received in plain bearing 38 secured as by nut 39 in the boss 40 formed integral with the head 30. The head 30 is provided intermediate its ends with a webbedbearing portion 4l in .which is also journaled a bearing portion 42 of the spindle 31. At its other end `the spindle 31 is again provided with a bearing portion 43 likewise received in a plain bearing 44 locked in position to the boss 45 of the head 30 by means of a nut 46. The rib bearing 41 is provided on opposite surfaces with a counterbore receiving antifriction thrust bearings 47 and 48 held in position respectively by a nut 49 and nut 50; The latter operating through a spiral gear 51 on the spindle. The spindle 31 is provided intermediate its ends with a tapered portion 52 on which is mounted a worm gear 53 secured thereon by means of a spanner nut 54.

From the foregoing it will be noted that the spindle 31 is suitably journaled in the head 30 and carries intermediate its ends the spiral gear 51 and worm gear 53, which are used for rotating the spindle at various speeds as will later appear.

The webbed bearing 41 is formed at its upper end with a trunnion portion 55 in which is fixed a trunnion shaft 56. The shaft 56 has secured thereon the inner races of anti-friction bearings 57 and 58, the outer races of which are secured in a cradle 59. The shaft 56 is further provided with a reduced end 60 on which is mounted anti-friction bearings 61 and 62 for supporting a sleeved gear 63. The end of the gear sleeve is provided with slots 64 receiving a driving pin 65 carried by a shaft 66 associated with a motor, here illustrated as an hydraulic motor 67. The motor 67 is adapted to rotate the shaft 66 at variable speeds and it is to be understood that instead of an hydraulic motor, a variable speed electric motor or any other prime mover may be employed for variably rotating the motor shaft 66 and consequently the gear 63. The cradle 59 has mounted in opposite ends thereof shafts 68 and 69 respectively shown in detail in Figures 6 and 7.

As shown in Figure 6, the shaft 68 is rotatably journaled in anti-friction bearings 70 and '11 carried by the end 72 of the cradle 59. The shaft 68 has secured to its one end a gear 73 adapted to mesh with the pinion or gear 63 on one side thereof. The-shaft 68 has further secured to it intermediate its ends a spiral pinion or gear 74 secured thereto as by means of a nut 75. The pinion 74 is adapted to mesh with the spiral gear 51 on the spindle 31.

As shown in Figure 7, the shaft 69 is likewise journaled in anti-friction bearings 76 and 77 carried by the other end 78 of the cradle 59. This shaft 69 has also secured to its one end a gear 79 similar to the gear 73 and adapted to mesh with the driving pinion or gear 63 on the side opposite to the meshing therewith of the gear 73. The shaft 69 has secured to it or formed integral therewith intermediate its ends a worm 80 adapted to mesh with the worm wheel 53 on the spindle 31.

The cradle 59 is oscillated about the axis of the trunnion shaft 56 for meshing either the worm 80 with the worm wheel 53 or the spiral pinion 74 with the spiral gear 51. From this it will be seen that with the gear 63 being rotated at a definite speed the spindle 31 will be rotated at a high and a. low speed depending on whether the spiral pinion and gear or the worm wheel and worm are meshed with one another. The means for oscillating the cradle 59 and selectively intermeshing the foregoing gears will be described in detail later.

In order to align the worm 8O and the throat of the worm wheel 53 for proper intermeshing engagement, the spindle 31 is adapted to be axially adjusted relative to its bearings 38 and 45 through the nuts 49 and 50. In other words, to shift the spindle 31 to the left, as seen in Figure 5, the lock nut 49 would be backed away from the thrust bearing 47 and the lock nut 50 then actuated in a direction for further tensioning the thrust bearing 48. This would have the effect of axially shifting the spindle 31 to the left until the nut 49 again engaged the thrust bearing 47 and secured the unit in proper position. In the event it was necessary to shift the spindle in the other direction, the reverse operation would be resorted to, namely, the nut 50 would be backed away from the spiral gear 51 and the nut 49 adjusted for taking up the play therebetween thereby again axially adjusting the spindle, this time to the right.

For rocking the cradle about the trunnion shaft 56, the head 30 is provided with a cover plate 84 on which is formed a track or way 81 for a rack bar 82. The rack bar 82 is prevented from inadvertent disassociation with the track 81 by means of a plate 83 secured to the said cover plate 84 of the head 30. The rack bar 82 is adapted to be axially adjusted along the track 81 for which purpose it has meshing with its teeth a pinion 85 secured to or formed integral with a stud 86 projecting through the cover plate 84 to the exterior thereof. Secured to the stud 86 exteriorly of the plate 84 is a hand lever 87 carrying a spring pressed plunger 88 co-operating with stops 89 and 90 formedy on the outside surface of the plate 84. The rack bar 82, as seen in Figure 5, is provided on opposite ends with cam faces 91 and 92 adapted to engage anti-friction rollers 93 and 94 carried by the opposite ends of the cradle 59. The rack 82 is further provided with fiat cam faces 95 and 96 adjacent the inclined cam faces 91 and 92 upon which the rollers 93 and 94 ride after being adjusted to the desired position. As seen in Figure 5, the bar 82 has been shifted `to the left causing the cam faces 91 and 95 to engage the roller 93 for oscillating the cradle 59 in a counterclockwise direction to cause interengagement between the spiral pinion 74 and spiral gear 51. From this it will be seen that if the rack bar 82 is actuated to the right, the cam faces 92 and 96 will engage with the roller 94 for oscillating the cradle in a clockwise direction and thereby intermeshing the worm 80 and worm wheel 53.

In the event that the worm and worm wheel or spiral gear and spiral pinion are properly aligned to intermesh their threads and teeth, but that too much play exists between the. ends of the threads and the teeth of the pinion and worm and the threads of the worm wheel and spiral gear, the following mechanism may be resorted to. The rollers 93 and 94 are respectively carried by a shaft 97 which extends through bearing lugs 98 and 99 formed on the opposite ends or portion of the cradle 59. The shaft 97 has the bearing portions 100 and 101 concentric with one 1,938,765. another and respectively received in the lugs 98 and 99. The shaft is further provided Ywith a portion 102 intermediate the concentric portions l100 and 101 which is slightly eccentric tothe axis thereof and which supports the anti-friction roller. The outer end of the shaft 97 has secured to it or formed integral therewith a ratchet 103 co-operating with a spring pressed detent 104 carried by the cradde 59. The ratchet 103 and shaft 97 are-provided with a socket 105 of angular cross section and adapted to receive a correspondingly formed or shaped wrench whereby the shaft 97 may be rotated aboutjthe axis of the bearing portions 100 and 101. From this it will be seen that with the rollers 93 and 94 on the ilat Vcam portions 95 and 96 of the rack bar, the proper rotation of the shaft 97 will cause the axis of the shaft carrying the spiral pinion and worm to either approach the axis of the spindle or be retracted therefrom and thereby properly intermesh the teeth of the driving members.

In practice the spindle 31 and regulating wheel 34 are adapted to be rotated at a relatively slow speed to properly control the rotation of the work while'it is in the grinding throat and being operated upon by the grinding wheel. For this purpose, the worm 80 and worm wheel 53 are normally intermeshed. In order to properly control the rotation of the work, however. it is necessary that the face of the wheel 34 be absolutely true and in practice this face wears, necessitating the re-truing thereof. In order to re-true the face of the abrasive regulating wheel, it is desirable to rotate said face at a relatively high rate of speed. In order, therefore, to readily actuate the wheel at this high rate of speed, the

cradle 59 is rocked in the opposite direction to thereby disengage the worm and worm wheel and eifect the engagement of the spiral pinion and gear. The speed of the motor or prime mover is not changed, so that immediately upon the completion of the re-truing operation the cradle is again rocked or .oscillated to interengage the worm and worm wheel, whereupon the regulating wheel will be driven at the previously established relatively slow work rotation controlling speed.

In order to true the active face of the regulat- I ing wheel, the head 30 is provided with a guide 106 for a. truing mechanism 107 which carries a diamond or other truing means 108. The mechanism 107 may be traversed relative to the regulating wheel by any desirable means, such as by an hydraulic piston contained within the hydraulic cylinder 109 shown in Figure 5.

After the work piece has been placed in the grinding throat on the work rest blade, the grinding wheel carriage is fed toward the regulating wheel to effect a stock removal from -the work piece. For this purpose the carriage 12 has extending from it, 'interiorly of the bed, a lug 110 which has journaled therein a nut 111 but held against axial movement relative thereto.I The nut is in threaded engagement with an adjusting screw 112'fixed to the bed at opposite ends as by bosses or bearings 113 and 114 whereby it is held against rotative movement. The nut 111 is further formed integral with or has secured to it a worm wheel 115 adapted to be meshed with a worm 116 integral with or secured to the end oi' a shaft 117. The shaft 117 extends through the carriage 12 and is Journaledin a bearing 118 formed integral with the said carriage. A hand wheel 119 is secured to the outer end of the shaft 117 whereby itis rotated for rotating the worm 116 andy nut 111 for causing movement of the carriage relative to the adjusting screw 112 and bed ways 11.

What is claimed is:

1. In a centerless grinder the combination of a bed, a pair of opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a spindle for the regulating wheel, a plurality of driven gears mounted on the spindle, a driving gear adapted to individually engage the driven gears, and means for axially adjusting the spindle and gears carried thereby for aligning same with the driven gears to eifect proper intermeshing ofthe teeth o! the driven and driving gears.

2. In a centerless grinder the combination of a bed, a pair of opposed grinding and regulating wheels carried thereby and forming a grinding throat therebetween, a spindle for the regulating wheel, a plurality of driven gears mounted on the spindle, a driving gear adapted to individually engage the driven gears, means for axially ad- Justing the spindle and gears carried thereby for aligning same with the driven gears to eilect proper intermeshing of the teeth of the driven and driving gears, the spindle, driven gears, and driving gears being enclosed within a head or housing, and means projecting from the housing for connecting the desired driving and driven gear.

3. A regulating wheel unit for use with centerless` grinders comprising a head or housing, l.

Aspindle rotatably journaled within the head. a

pair of gears mounted on the spindle within the housing each of a different lead, a second pair of gears within the housing each of a diii'erent lead and adapted respectively to mesh with the gears of the spindle whereby while the second pair of gears is rotated at the same rate the spindle will be rotated at different rates, means for axial-` ly adjusting the spindle and gears relative to the head for aligning the teeth of the two pairs of gears with one another, and means exteriorly of the head for selectively intermeshing one gear 120 of each pair with its complementary gear of the other pair.

4. A regulating wheel unit for use with centerlessgrinders comprising a head or housing, a spindle rotatably Journaled within the head, a pair oi' gears mounted on the spindle within the housing each of a different lead, a second pair of gears within the housing each of a different lead and adapted respectively to mesh with the gears of the spindle whereby while the second m pair of gears is rotated at the same rate the spindle will be rotated at diil'erent rates, means for l axially adjusting the spindle and gears relative to the head for aligning the teeth of the two pairs of gears with one another, means exteriorly of 135 the head for selectively intermeshing one gear of each pair with its complementary gear of the other pair, a cradle oscillatably mounted interiorly of the head and carrying at opposite ends thereof a gear of one oi' the pairs, and a'cam 140 associated with the gear meshing means for oscillating the cradle.

5. In a regulating wheel unit for use with a centerless grinder the combination of a head, a spindle rotatably mounted in the head, a regulating wheel on the end of the spindle, a gear on the spindle, a worm wheel on the spindle, a second gear and worm carried by the housing and adapted respectively to be intermeshed with the gear and worm wheel of the spindle, a thrust 15o bearing within the head and disposed between the worm wheel and gear, means carried by the spindle for creating the thrust on the bearings, and means including the thrust creating means for eecting an axial adjustment of` the spindle relative to the head to align the throat of the Worm wheel with the worm to effect proper intermeshing of the teeth of the worm and worm wheel. f

6. In a -regulating wheel unit for use with a centerless grinder the combination of a head, a spindle rotatably mounted therein, a regulating wheel secured to the spindle, a gear on the spindle, a wormY wheel on the spindle, a second gear and a worm'within the head adapted to be respectively meshed with the gear and the worm wheel on the spindle, whereby rotation of the gear and worm will rotate the spindle at different speeds, andmeans for driving said gear and wormat a constant speed.

'7. In a regulating wheel unit for use with a centerless grinder the combination of ahead, a spindle rotatably mounted therein. a regulating wheel secured to the spindle, a gear on the spindle, a worm wheel on the spindle, a second gear and a wormwithin the head adapted to be respectively meshed with the gear and the worm wheel on the spindle, whereby rotation of the second gear andworm will rotate the spindle at ldifferent speeds, means for driving said second gear and worm at a constant speed, including a gear associated with the second gear, a gear associated with the worm, a driver intermeshed with the driving gears of said second gear and worm, and a motor for actuating the driver.

8. In a regulating wheel unit for use with a centerless grinder the combination of a head,

l a spindle rotatably journaled therein, a regulating wheel secured to the spindle, a gear and a worm wheel secured to the spindle interiorly of the head, a pinion and worm interiorly of the head adapted respectively to be meshed with the gear and worm wheel, a cradle oscillatably mounted within the head and supporting the pinion and worm, a rack bar carried by the head and adapted to be axially adjusted relative thereto, and a cam on each end of the rack bar for engaging opposite ends of the cradle to effect oscillation thereof and interengagement of the pinion and gear or worm and worm wheel.

`9. In a regulating wheel unit for use with a centerless grinder the combination of a head, a spindle rotatably journaled therein, a regulating wheel secured to the spindle, a gear and a worm wheel secured to the spindle interiorly of the head, a pinion and worm interiorly of the head adapted respectively to be meshed with the' gear and worm wheel, a cradle oscillatably mounted within the head and supporting the pinion and worm, a rack bar carried by the head and adapted to be axially adjusted relative thereto, a cam on 'each end of the rack bar for engaging opposite ends of the cradle to effect oscillation thereof and interengagement of the pinion and gear or Worm and worm wheel, a rack pinion engaged,v

with Ythe rack cam, a shaftextending from the pinion exteriorly of the head, a manually actuable handle secured to the shaft, and stops limiting the oscillation of the handle and consequent axial movement of the rack bar.

10. In a regulating wheel unit for use with a centerless grinder the combination of a head, a spindle rotatably journaled therein, a gear and a Worm wheel carried by the spindle, a pinion and worm adapted to be meshed respectively with the gear and worm wheel, a cradle 'oscillatably mounted interiorly of the head and supporting the pinion and worm, a cam for oscillating the cradle and intermeshng the pinion and gear or worm and worm Wheel, and means adjusting the pitch circle of the pinion and worm toward the gear and worm Wheel to eicct proper intermeshing engagement of the teeth of said parts.

1l. In a regulating wheel unit for use with a centerless grinder the combination of a head, a spindle rotatably journaled therein, a gear and a worm wheel carried by the spindle, a pinion and worm adapted to be meshed respectively with the gear and worm wheel, a cradle oscillatably mounted interiorly of\ the head'and supporting the pinion and worm, a cam for oscillating the cradle and intermeshing the pinion and gear or worm and worm wheel, means adjusting the pitch circle of the pinion and worm toward the gear and worr'n wheel to effect proper intermeshing engagement of the teeth of said parts, and means rotating the pinion and worm at the same speed. comprising a driven gear associated with each, a driving gear in simultaneous engagement with said driven gears, a motor, and an operative connection between said motor and driving gear.

l2. In a regulating wheel unit for use .with a centerless grinder the combination of a head, a spindle rotatably journaled therein, a gear and a worm wheel carried by the spindle, a pinion and worm adapted to be meshed respectively with the gear and worm wheel, a cradle oscillatably mounted interiorly of the head and supporting the pinion and worm, a cam for oscillating the cradle and intermeshing the pinion and gear or worm and worm wheel, means adjusting the pitch circle of the pinion and worm toward the gear and Worm wheel to effect proper intermeshing engagement of the vteeth of said parts, and means rotating the pinion and Worm at the same speed, comprising a driven gear associated with each, a driving gear in simultaneous engagement with said driven gears, a motor, and an operative connection between said motor and driving gear, said connection comprising a sleeve associated with the driving gear, said sleeve having a slot therein, and a pin associated with the motor shaft and received in the sleeve slot whereby the sleeve gear is driven even though not in absolute alignment with the motor shaft axis.

13. A regulating wheel unit for use with centerless grinders the combination of a head, a spindle rotatably mounted therein, a pair of gear members secured to the spindle, an oscillatable cradle carried by the head, a pair of gear members complementary to the spindle gear members rotatably carried by the cradle, means for adjusting the spindle axially relative to the head to align the gear members thereof with the cradle gear members, means for oscillating the cradle to independently intermesh the gear members of the cradle with the gear members of the spindle, and additional means for effecting a further-oscillation of the cradle to properly intermesh the gear members.

14. A regulating wheel unit for use with centerless grinders the combination of a head, a spindle rotatably mounted therein, a pair of gear members secured to the spindle, an oscillatable cradle carried by the head, a pair of gear members complementary to the spindle gear members rotatably carried by the cradle, means for adjusting the spindle axially relative to the head to align the gear members thereof with the cradle gear members, means for oscillating the cradle to independently intermesh the gear members of the cradle with the gear members of the spindle, additional means for effecting a further oscillation of the cradle to properly intermesh the gear members, and means for locking the said last mentioned cradle oscillation means in position.

15. A regulating wheel unit for use with centerless grinders the combination of a head, a spindle rotatably mounted therein, a pair of gear members secured to the spindle, an oscillatable cradle carried by the head, a pair of gear members complementary to the spindle gear members rotatably carried by the cradle, means for adjusting the spindle axially relative to the head to align the gear members thereof with the cradle gear members, means for oscillating the cradle to independently intermesh the gear members of the cradle with the gear members of the spindle, additional means for effecting a further oscillaltion of the cradle to properly intermesh the gear members, and means for locking the said last mentioned cradle oscillation means in position, including a shaft carried by the cradle Vand having thereon an eccentric, a ratchet on the shaft, and a spring pressed pawl co-operating with the ratchet.

16. A regulating Wheel unit for use with a centerless grinder the combination of a head or housing, a spindle rotatably journaled therein, a pair of gear members carried by the spindle, a cradle oscillatably mounted in the head, a pair of gear members rotatably mounted in the cradle for independent interengagement with the spindle gear members, the said cradle gear members and spindle gear members having a different ratio whereby rotation of the cradle gear members at a constant speed effects a different speed of the spindle, a rack bar associated with the head, cam means on the bar, cam followers on the cradle, and means for axially shifting the bar to cause interengagement between its cams'and the cam followers on the cradle whereby said cradle is oscillated.

17. A regulating wheel unit for use with a centerless grinder the combination of a head or housing, a spindle rotatably journaled therein, a pair of gear members carried by the spindle, a cradle oscillatably mounted in the head, a pair of gear members rotatably mounted in the cradle for independent interengagement with the spindle gear members, the said cradle gear members and spindle gear members having a different ratio whereby rotation of the cradle gear members at a constant speed effects a different speed of the spindle, a rack bar associated with-the head, cam means on the bar, cam followers on the cradle, and means for axially shifting the bar to cause interengagement between its cams and the cam followers on the cradle whereby said cradle is oscillated, said means including a rack pinion disposed within the head and having a shaft projecting exteriorly of the head, and

manually operable means exterior of the head for rotating the shaft and pinion for axially shifting the rack bar.

18. A regulating wheel unit for use with a centerless grinder the combination of a head or housing, a spindle rotatably journaled therein, a pair of gear members carried by the spindle,a cradle oscillatably mounted in the head, a pair of gear members rotatably mounted in the cradle for independent interengagement with the spindle gear members, the said cradle gear members and spindle gear members having a different ratio whereby rotation of the cradle gear members at a constant speed effects a different speed of the spindle, a rack bar associated with the head, cam means on the bar, cam followers on the cradle, means for axially shifting the bar to cause interengagement between its cams and the ca m followers on the cradle whereby said cradle is oscillated, and means for adjusting the cam followers relative to the rack cam portions for effecting a further oscillation of the cradle and a proper intermeshing of the gear members of the cradle and spindle.

19. A regulating wheel unit for use with a centerless grinder the combination of a head or housing, a spindle rotatably journaled therein, a pair of gear members carried by the spindle, a cradle oscillatably mounted in the head, a pair of gear members rotatably mounted in the cradle for independent interengagement with the spindle gear members, the said cradle gear members and spindle gear members having a different ratio whereby rotation of the cradle gear members at a constant speed effects a different speed of the spindle, a rack bar associatedwith the head, cam means on the bar, cam followers on the cradle, means for axially shifting the bar to cause interengagement between its cams and the cam followers on the cradle whereby said cradle is oscillated, means for adjusting the cam followers relative to the rack cam portions for effecting a further oscillation of the cradle and a proper intermeshing of the gear members of the cradle and spindle, and means for locking the cam follower adjusting means in adjusted positions.

20. A regulating wheel unit for use with a centerless grinder the combination of a head or housing, a spindle rotatably journaled therein, a pair of gear members carried by the spindle, a cradle oscillatably mounted in the head, a pair of gear members rotatably mounted in the cradle for independent interengagement with the spindle gear members, the said cradle gear members and spindle gear members having a different ratio whereby rotation of the cradle gear members at a constant speed effects a different speed of the spindle, a rack bar associated with the head, cam means on the bar, cam followers on the cradle,

means for axially shifting the bar to cause interengagement between its cams and the cam followers on the cradle whereby said cradle is oscillated, means for adjusting the cam followers relative to the rack cam portions for effecting a further oscillation of the cradle and a proper intermeshing of the gear members of the cradle and spindle, and means for locking the cam follower adjusting means in adjusted positions, said cam follower adjusting means comprising a shaft rotatably carried by the cradle having an eccentric portion thereon for the follower, and the means for locking the adjusting means in adjusted positions comprising a ratchet on the shaft, and a spring pressed pawl carried by the cradle.

FREDERICK S. HAAS. 

